Abstract

Addition of KOH to aqueous solutions containing in a 3 : 1 molar ratio chloromethanephos-phonic acid (H2L), rare-earth ions (Ln3+) results in crystallization of LnHL2 (Ln = La-Er, Y) andKLn3H6L8 (Ln = Yb, Lu). According to powder diffraction patterns, all the compounds within the LnHL2 andKLn3H6L8 groups are isostructural. Thulium forms a mixture of these two compounds. The solubility, IR spectra, and thermal stability of the products were studied.

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